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Message-Id: <1471950871-9112-1-git-send-email-phil@nwl.cc> Date: Tue, 23 Aug 2016 13:14:31 +0200 From: Phil Sutter <phil@....cc> To: David Miller <davem@...emloft.net> Cc: netdev@...r.kernel.org Subject: [net-next PATCH] net: rtnetlink: Don't export empty RTAX_FEATURES Since the features bit field has bits for internal only use as well, it may happen that the kernel exports RTAX_FEATURES attribute with zero value which is pointless. Fix this by making sure the attribute is added only if the exported value is non-zero. Signed-off-by: Phil Sutter <phil@....cc> --- net/core/rtnetlink.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 189cc78c77eba..318fc5231b2b4 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -704,6 +704,8 @@ int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) } else if (i == RTAX_FEATURES - 1) { u32 user_features = metrics[i] & RTAX_FEATURE_MASK; + if (!user_features) + continue; BUILD_BUG_ON(RTAX_FEATURE_MASK & DST_FEATURE_MASK); if (nla_put_u32(skb, i + 1, user_features)) goto nla_put_failure; -- 2.8.2
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